UCD QueryUCD_webivo://xaovo/ucd/q/queryXinjiang Astronomical Observatory,CASAuthor: Zhang Hailong, UCD Center2023-06-08T04:11:34ZZhang Hailong150 Science 1-Street, Urumqi, Xinjiang 830011, Chinazhanghailong@xao.ac.cn+86 18699134012IVOA UCD The Unified Content Descriptor (UCD) is a formal vocabulary
astronomical data that is controlled by the International Virtual
Observatory Alliance (IVOA). The vocabulary is restricted in order to
avoid proliferation of terms and synonyms, and controlled in order to
avoid ambiguities as far as possible. It is intended to be flexible,
so that it is understandable to both humans and computers. UCDs
describe astronomical quantities, and they are built by combining
words from the controlled vocabulary.http://data.xao.ac.cn/ucd/q/query/info The data List of UCD obtained from ucd1p-words-20070402.txt
(http://cdsweb.u-strasbg.fr/UCD/).ucdUCD Query The Unified Content Descriptor (UCD) is a formal vocabulary
astronomical data that is controlled by the International Virtual
Observatory Alliance (IVOA). The vocabulary is restricted in order to
avoid proliferation of terms and synonyms, and controlled in order to
avoid ambiguities as far as possible. It is intended to be flexible,
so that it is understandable to both humans and computers. UCDs
describe astronomical quantities, and they are built by combining
words from the controlled vocabulary.
ucd.data The Unified Content Descriptor (UCD) is a formal vocabulary
astronomical data that is controlled by the International Virtual
Observatory Alliance (IVOA). The vocabulary is restricted in order to
avoid proliferation of terms and synonyms, and controlled in order to
avoid ambiguities as far as possible. It is intended to be flexible,
so that it is understandable to both humans and computers. UCDs
describe astronomical quantities, and they are built by combining
words from the controlled vocabulary.ucdUnified Content Descriptors from IVOAcharnullableucd_descThe simple explaination of UCDcharnullable